Illegitimate WNT pathway activation by beta-catenin mutation or autocrine stimulation in T-cell malignancies

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Recent studies in mice have shown a role for the canonical WNT pathway in lymphocyte development. Because cancers often arise as a result of aberrant activation of signaling cascades that normally promote the self-renewal and expansion of their progenitor cells, we hypothesized that activation of the WNT pathway might contribute to the pathogenesis of lymphoproliferative disease. Therefore, we screened a large panel (n = 162) of non-Hodgkin lymphomas (NHL), including all major WHO categories, for nuclear expression of beta-catenin, at hallmark of "active" WNT signaling. In 16 lymphomas, mostly of T-lineage origin, nuclear localization of beta-catenin was detected. Interestingly, some of these tumors contained established gain-of-function mutations in the gene encoding beta-catenin (CTNNB1); however, in the majority, mutations in either CTNNB1 or APC were not detected. Functional analysis of WNT signaling in precursor T-lymphoblastic lymphomas/leukemias, the NHL subset in which beta-catenin accumulation was most prevalent. (33% positive), revealed a constitutively activated, but still responsive, WNT pathway, which controlled T-cell factor-mediated gene transcription and cell growth. Our data indicate that activation of the WNT pathway, either by CTNNB1 mutation or autocrine stimulation, plays a role in the pathogenesis of a subset of NHLs, in particular, those of T-cell origin
Original languageEnglish
Pages (from-to)6969-6977
Number of pages9
JournalCancer research
Issue number17
Publication statusPublished - 1 Sept 2008


  • Base Sequence
  • DNA Primers
  • Immunohistochemistry
  • Lymphoma, T-Cell/metabolism
  • Mutation
  • RNA, Messenger/genetics
  • Signal Transduction
  • Wnt Proteins/metabolism
  • beta Catenin/genetics

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